Put a strong magnet on a float around a rod that goes down one side. Put a hall effect device at 1/2 and nearly empty. The rest goes without saying. DLC Philippe Habib wrote: > I have used sensors from SIE Sensorik to read liquid level through a > plastic wall. They are easy to use, can be calibrated for sensitivity > and are very reliable. > On Jan 13, 2009, at 5:43 PM, Enki wrote: > >> I need to measure the liquid level inside a transparent plastic >> bottle. I need to know when the liquid is below half bottle height and >> when the bottle is almost empty. Just two steps. >> The plastic bottle measures 12cm high x 8cm x 3cm. >> I'm not allowed to insert any probe in the bottle. >> There are four bottles side by side. >> >> I was thinking on metal plates mounted on each side of each bottle >> and using the capacitance method. >> >> Or a B&W video camera and some processing. I could generate four >> sample windows on each video line and integrate the samples. The four >> integrated signals would represent the liquid level on each bottle. >> An ATMEGA48 would do the level measurement with four ADCs. >> >> Comments, please. >> >> Thanks, >> Mark Jordan >> >> >> ------------------------------------ >> >> Yahoo! Groups Links >> >> >> > > > ------------------------------------ > > Yahoo! Groups Links > > > -- ------------------------------------------------- Dennis Clark TTT Enterprises www.techtoystoday.com -------------------------------------------------
Message
Re: [AVR-Chat] Liquid level measurement
2009-01-14 by dlc